By using pageTsConfig it is now possible to change the available fields
and add additional entries to the selectbox.

Resolves: #83449
Releases: master
Change-Id: I0985185b3711173387b68f7a3254082faa421476
Reviewed-on: https://review.typo3.org/55241


Reviewed-by: Reiner Teubner <rteubner@me.com>
Tested-by: Reiner Teubner <rteubner@me.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>